<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>表单</title>
</head>
<body>
	<ul>
		<li>
			<a href="http://www.baidu.com" target="myIframe">百度</a>
		</li>
		<li>
			<a href="http://www.jd.com" target="myIframe">京东</a>
		</li>
	</ul>
	<iframe src="demo3-1.html" name="myIframe" frameborder="3"></iframe>
</body>
</html>